Leather-skiving machine



(No MQdel.) 2 sheets sheet l.

J. A. SAPFORD. LEATHER SKIVING MACHINE.

No. 442,899. Patented Dec. 9,1890.

E E1 LL.-

\A IT 5555: l I INVENTU m fiqi (No Model.) 2 Sheets-S11eet 2.

J. A. SAPPORD.

LEATHER SKIVING MAGHINE. No. 442,399. Patented Dec. 9, 1890.

WITNEEEEE lNVE INTElRi fi 7 UNITED STATES PATENT OEEIcE.

JOSEPH A. SAFFORD, OF BOSTON, MASSACHYSETTS.

LEATHER-SKIVING MACHINE.

SPECIFICATION forming part of Letters Patent No. 442,399, dated December9, 1890.

Application filed June 21, 1890. Serial No. 356,231. (No model.)

To all whom it may concern:

Be it known that I, JosEPH A. SAFFORD, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Leather Skiving or Beveling Machines, of which thefollowing a specification.

This invention has for its object to provide a simple and effectivemachine for skivin g or beveling leather, adapted to cut diagonallythrough a strip of leather of any thickness Within reasonable limitsfrom one side to the other to produce a skived or beveled surface of anydesired length,terminating in aknifeedge.

The invention consists in the improved machine including a leathersplitting or skiving knife and an adjustable segmental bed co-operatingtherewith, which I will now proceed to describe and claim.

Of the accompai'iying drawings, forming a part of this specification,Figure 1 represents a top view of a leather beveling or skiving machineembodying my invention. Fig. 2 represents an end view of the same. Fig.3 represents a section on line 3 3, Fig. 1. Fig. 4 represents asectional view showing the relative position of the knife and theleather-supporting bed at the end of the skiving operation.

The same letters of reference indicate the same parts in all thefigures.

The chief features of my invention are a knife (1, adapted to split orskive leather, a segmental bed Z), adapted to support the leather whileit is being beveled or skived, and holders for said knife and bed, saidholders being pivotally connected, so that one can oscillate relativelyto the other, and means for adj usting the bed to make it more or lesseccentric to the cutting-edge of the knife.

The details of construction whereby the machine having said principalparts is made operative, as hereinafter described, may be variouslymodified, and the invention is not limited to the details hereinafterreferred to, the construction here shown and described being a good andpractical way of carrying my invention into practice.

The knife is here shown as attached to a fixed support or holdercomprising two vertical standards 0 c and a base 0'.

(Z represents a frame or holder, which is pivoted at e to the saidstandards 0 c, and is adapted to be oscillated on said pivot.

The segmental bed I) is connected at one end to the swinging end of theframe or holder (1 by a hinge or pivot p. The pivoted end of the bed andthe cutting-edge of the knife are substantially equidistant from thepivot or axis e, that connects the bed-holder (l with theknife-supporting frame, so that when the bed is turned to the positionwhich brings its pivoted end nearest to the knife the surface of the bedwill be in close proximityto or will bear against the knife, as shown inFig. l, which represents the position of the bed at the end of the outwhich forms the skived or beveled surface on apiece of leather supportedby said bed. The bed is adapted to swing on the pivot 1), that connectsit to the holder, so that its forward end or the one opposite the hingedend can be moved inwardly or outwardly to make the curved surface of thebed more or less eccentric to the knife, or, in other words, to separatethe rear end or portion of the bed from the edge of the knife more orless when the bed is in the position shown in Figs. 2 and 3, so that thesurface of the bed adjacent to the knife will gradually approach theknife when the bed is moving from the posit-ion shown in Figs. 2 and 3to that shown in Fig. i, and thus cause theknife to make an elongateddiagonal cut through a piece of leather supported on said bed, the bedbeing first adjusted when its hinged end is depressed so that the knifewill bear on the outer surface of the leather, and then moved in thedirection indicated by the arrow in Fig. 3 until its rear or hinged endcomes in contact with the knife, as shown in Fig. 1L, the result beingthe cutting of the leather on a true bevel.

To adjust the bed as above described, I provide the bed-holder (Z withan adjustingscrew f, which bears on a shoulder 011 the under side of thebed, as shown in Fig. 5. A spring g, secured at one end to the bed or toa projection thereon and at the other end to the bed-holder (I, holdsthe bed with a yielding pressure against said adj Listingscrew. It willbe seen, therefore, that by turning said screw in one direction or theother the forward end of the bed may be moved from or toward the knife,as the case may be, thus making the bed more or less eccentric to theknife.

i represents a pressure bar or roll, which is supported by theknife-supporting frame, and is arranged to bear with a yielding pressureupon the leather on the bed at a point close to the cut-tingedge of theknife and to press the leather closely against the surface of the bed.The ends of said roll or bar are inserted in sockets formed in sleevesor boxes mm, which are vertically movable on studs or guides jaffixed totheknife-supporting frame. Springs 7t: 70 on said guides press the boxesm and roll or bari downwardly on the leather on the bed. Adjustablestop-screws o are located on the knife-supporting frame in posi tion tolimit the downward movement of the roll or bar 2'. v

q represents a clamp, which is adapted to secure the leather strip tothe rear end of the bed during the skiving operation. Said clamp is hereshown as a bar provided at its ends with ears q g, which are pivoted atr to the bed I). The clamp is provided with a flange or jaw (1 which isadapted to overlap the rear end of the bed, as shown in Fig. 3, and witha handle or lever (1 whereby the clamp may be raised from and presseddownwardly upon the bed. hen a piece of leather is secured to the bed bythe clamp, the lever (1 may be utilized as the means for moving the bedin the direction required to cause the described skiving or bevelingaction.

The operation of the device above described is as follows: The pivotedend of the bed being depressed, as shown in Figs. 2 and 3, the operatorplaces the piece of leather to be skived upon the bed and clamps saidpiece to the rear end of the bed. The bed is then adjusted to press theupper side of the piece of "leather against the knife, and then the bedis moved in the direction indicated by the arrow in Fig. 3 by pressureon the handle (1 until it reaches the position shown in Fig. 4, theknife at this point reaching the inner side of the leather after havingmade an elongated diagonal cut therethrough.

It will be seen that leather of any reasonable thickness can be cut bythis machine, the knife passing diagonally through a strip of anythickness, so that its cutting action commences at the outer andterminates at the inner side of the strip without regard to thethickness thereof, the out being in each case a true bevel or taper, theinclination of which is governed by the thickness of the strip and bythe distance from the pivoted end of the bed at which the cutting actionwas commenced. For example, if it is desired to make the taperlon g andgradual the bed will be moved to depress the pivoted end farther thanwhen a shorter and more abrupt taper is desired, the bed being moved inthe latter case so that a portion of its periphery nearer the pivotedend will be under the knife. Itwill be seen that the clamp, be-

ing connected directly to the bed, is not affected by any adjustment ofthe latter, but always maintains the same operative relation to the bedunder all adjustments of the latter.

It is obvious that any other suitable clamping device to secure theleather to the rear end of the bed may be adopted without departing fromthe spirit of my invention.

The machine is particularly adapted for skiving the ends ofbelting-strips, but may be used on strips of leather for any purpose.

If desired, the pivoted end 1) of the bed may be fixed and theknife-supporting frame adapted to oscillate on the pivot e, the bedstill being adjustable, as above described, to make it more or lesseccentric to the knife.

1 claim 1. In aleather beveling or skiving machine, the combination of afixed knife, a supporting-frame therefor, a holder or support pivotallyconnected at its inner end to the knifesupporting frame, a segmental bedpivotally connected at one end to the outer end of said holder orsupport, the pivoted end of the bed and the cutting-edge of the knifebeing practically equidistant from the pivot or axis that connects thebed holder or support to the knife-supporting frame, whereby thecutting-edge of the knife is brought close to or in contact with thesurface of the bed when the pivoted end of the latter is at its closestapproach to the knife, and means foradjusting the bed to make itssupporting-surface more or less eccentric to the cutting-edge of theknife, and thereby enabling the knife to commence its action on theouter side of a piece of leather of any desired thickness supported bysaid bed and to form a taper any desired length on the said piece, asset forth.

2. In a leather beveling or skiving machine, the combination of a fixedknife, a supporting-frame therefor, a holder or support pivotallyconnected at its inner end to the knifesupporting frame, a segmental bedpivotally connected at one end to the outer or adjustable end of saidholder or support, the pivoted end of the bed and the cutting-edge ofthe knife being practically equidistant from the pivot or axis of thebed holder or support, means for adjusting the bed to makeitssupporting-surface more or less eccentric to the knife, and a clampconnected with the rear or adjustable end of the bed, whereby astrip ofleather may be secured to said end, the connection of the clamp to theadjustable end of the bed enabling the clampto operate alike under alladjustments of the bed, as set forth.

In a leather beveling or skiving machine, the combination of a fixedknife, a fixed supporting-frame therefor, a holder or support pivotallyconnected at its inner end with the knife-supporting frame and adaptedto be oscillated, a segmental bed pivoted at one end to the swinging endof said frame, the piv- ICC oted end of the bed and the cuttil'ig-edgeof the knife being substantially equidistant from the axis on which thebed holder or su pport oscillates, an adjusting screw mounted on saidbed holder or support and arranged to bear on the segmental bed, and aspring arranged to hold said bed in contact with the adjustingscrew, asset forth.

4. In a leather beveling or skiving machine, the combination of a knife,a fixed supporting-frame therefor, a holder or support pivotallyconnected with the knife-supporting frame and adapted to be oscillated,a segmental bed pivot-ed at one end to the swinging end of said holder,the pivoted end of the bed and the cutting-edge of the knife beingsubstantially equidistant from the axis on JOSEPH A. SAFFORD.

Witnesses:

C. F. BROWN, A. D. HARRISON.

